Have been playing through the Dungeon WiiWare games. I'll update this update with further information as it comes. Should have content up soon. Since Heart Gold & Soul Silver has been announced, the Chatroom (http://www.serebii.net/chat.shtml) & WiFi Chatroom (http://www.serebii.net/chat-wifi.shtml) have been booming with discussion & trade respectively so be sure to visit them.

http://www.serebii.net/heartgoldsoulsilver/apricorns.jpg (http://www.serebii.net/heartgoldsoulsilver)
In The Games Department

Pokémon Heart Gold & Soul Silver

The first CoroCoro scans have come out and have revealed a fair bit of information.

First, it confirms that the Apricorns come back. The apricorns a're stored in an item called the Apricorn Case. This means the following balls have returned, for reference here are their use:

In addition, this time, you have the ability to grow berries yourself portabley within an item called the Berry Planter, using the SquirtBottle to grow them and
Next, it reiterates Kanto's return in Heart Gold & Soul Silver and also shows there is a new Battle Frontier style facility to the west of Olivine City. Further details about this Battle Frontier have not been revealed
It also confirms the National Park's Bug Catching Contest making a return. This contest features you having to capture the best Bug Pokémon you can.
It also shows that Rayquaza is catchable later in the game at Level 50. Further details were not revealed but as revealed in June, it will require Kyogre & Groudon for it to appear
It also shows that you have the Mystery Egg subquest from Gold & Silver. It is unknown if the Egg you receive will still be Togepi
Finally, it confirms that the new area west of Cianwood City is a Safari Zone.
We'll bring more as it comes